Date: | Thu, 8 Feb 2007 14:01:18 -0200 |
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From: | Filipe <scoton@xxxxxxxxx> |
Subject: | [Gems-users] L2 cache banks question |
Hi! I have a question about banks with the MSI_MOSI_CMP_directory and the MOESI_CMP_directory... I did some tests using 4, 8 and 16 banks with both protocols and an L2 cache with 16MB and 8MB... The CMP has 32 cores accessing the L2... For SPLASH2-OCEAN, I got similar results for each protocol... these are the execution times in cycles... MSI: 110681587 - 16MB - 16 banks 110882613 - 16MB - 4 banks 110007560 - 16MB - 8 banks 112847680 - 8MB - 16 banks 115278293 - 8MB - 8 banks 114196480 - 8MB - 4 banks MOESI: 91810800 - 16MB - 16 banks 90638080 - 16MB - 8 banks 91811853 - 16 MB - 4 banks 91366667 - 8 MB - 16 banks 90484880 - 8 MB - 8 banks 92219093 - 8 MB - 4 banks the differences are less then 5% in each protocol... is that correct? why is it so small? is the number of banks too small for the number of cores? I would appreciate any kind of help to understand this. Thank you very much! -- Filipe Montefusco Scoton |
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